After three decades of interviewing self-made millionaires, Steve Siebold, author of "How Rich People Think," has concluded that the wealthy just think differently about money than the middle class. Here are five examples of what he learned:

More than half of those recently polled by Gallup said an income of no more than $150,000 would qualify that person as rich. When asked how much money per year would be necessary for them to consider themselves "rich," 53 percent mentioned an income of $150,000 or less, and 71 percent said an income of $300,000 would be enough.

Danny Kofke is a special education teacher in Atlanta. Married with two young daughters, Danny recently wrote A Simple Book of Financial Wisdom: Teach Yourself (and Your Kids) How to Live Wealthy with Little Money. The title says it all. Here are his tips:

Millionaires are back. The number of individuals worldwide with $1 million or more in assets aside from their residence grew by 8.3% to 10.9 million in 2010, topping pre-crisis 2007 levels, according to the World Wealth Report released Wednesday.

It's a contentious personal finance debate: To stay out of debt and get rich, should we focus on controlling our small purchases, or put most of our effort into making the big gains in areas like earnings? DailyFinance asks three of the Web's most popular personal finance bloggers for their views.

The GOP approach of cutting taxes and slashing expenses has its attractions: Nobody likes paying taxes, and "tightening our belts" sounds ever so grown up. But these proposed cuts in taxes and spending will benefit the wealthy, while placing an outsized burden on the country's poor and middle class.

When it comes to its population of millionaires, the U.S. still leads the world, but other countries have gained recently, The Boston Consulting Group reports. In particular, the report found a stagnation of wealth growth in developed nations, but rapid wealth growth in the developing world.

The gap between America's super-wealthy and the rest of us has grown so vast it's hard to even comprehend the sums they spend on their luxuries. But if you measure, say, a $200 million luxury yacht in terms of the average U.S. family's household income, the picture comes back into focus.

The richest countries in the world must have either a small population combined with a very wealthy ruling class, or a large middle class and a wealthy top tier. See who makes 24/7 Wall Street's list of the top 10 wealthiest nations in the world.